1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ioport.h>
3#include <asm/io.h>
4
5#include "pc873xx.h"
6
7static unsigned pc873xx_probelist[] = {0x398, 0x26e, 0};
8
9static char *pc873xx_names[] = {
10	"PC87303", "PC87306", "PC87312", "PC87332", "PC87334"
11};
12
13static unsigned int base, model;
14
15
16unsigned int __init pc873xx_get_base(void)
17{
18	return base;
19}
20
21char *__init pc873xx_get_model(void)
22{
23	return pc873xx_names[model];
24}
25
26static unsigned char __init pc873xx_read(unsigned int base, int reg)
27{
28	outb(reg, base);
29	return inb(base + 1);
30}
31
32static void __init pc873xx_write(unsigned int base, int reg, unsigned char data)
33{
34	unsigned long flags;
35
36	local_irq_save(flags);
37	outb(reg, base);
38	outb(data, base + 1);
39	outb(data, base + 1);		/* Must be written twice */
40	local_irq_restore(flags);
41}
42
43int __init pc873xx_probe(void)
44{
45	int val, index = 0;
46
47	while ((base = pc873xx_probelist[index++])) {
48
49		if (request_region(base, 2, "Super IO PC873xx") == NULL)
50			continue;
51
52		val = pc873xx_read(base, REG_SID);
53		if ((val & 0xf0) == 0x10) {
54			model = PC87332;
55			break;
56		} else if ((val & 0xf8) == 0x70) {
57			model = PC87306;
58			break;
59		} else if ((val & 0xf8) == 0x50) {
60			model = PC87334;
61			break;
62		} else if ((val & 0xf8) == 0x40) {
63			model = PC87303;
64			break;
65		}
66
67		release_region(base, 2);
68	}
69
70	return (base == 0) ? -1 : 1;
71}
72
73void __init pc873xx_enable_epp19(void)
74{
75	unsigned char data;
76
77	printk(KERN_INFO "PC873xx enabling EPP v1.9\n");
78	data = pc873xx_read(base, REG_PCR);
79	pc873xx_write(base, REG_PCR, (data & 0xFC) | 0x02);
80}
81
82void __init pc873xx_enable_ide(void)
83{
84	unsigned char data;
85
86	printk(KERN_INFO "PC873xx enabling IDE interrupt\n");
87	data = pc873xx_read(base, REG_FER);
88	pc873xx_write(base, REG_FER, data | 0x40);
89}
90